Canvas.height | LuaRT free and open source Windows programming framework for Lua

Canvas.height read/write property

Get or set the height of the Canvas area. The height starts from 0 (top side of the Canvas) and increase to the bottom direction.

Example


local ui = require "ui"
require "canvas"

-- create a simple window
local win = ui.Window("Canvas.height sample", 600, 400)
local Canvas = ui.Canvas(win)
Canvas.align = "all"

function Canvas:onPaint()
  self:begin()
  self:clear() 
  self:fillellipse(300,200, 50, 50, 0xdc4f2bff)
  self:flip()
end

-- Launch async Task for ui
ui.run(win)

-- Async Task to decrease Canvas height
async(function()
    while win.visible do
        Canvas.height = Canvas.height - 5
        if Canvas.height <= 0 then
            win:hide()
            sys.exit()
        end
        sleep()
    end
end)

-- wait for all tasks
waitall()